Indoor cats like ample stay to roam and play, as well as access to multiple hiding spaces. Exercise is important as cats are very active pets and so room to play as well as access to cat toys such as scratching posts are very beneficial. Indoor cats are more secluded than outdoor cats are so will need to be interacted with more often. Indoor cats will also appreciate access to a clean litter tray in a private area, to do their business.
Cats with outdoor access benefit from more opportunities to exhibit natural behaviours like climbing, exploring, roaming their territory and communicating with other cats in the area.
Keeping your cat as a house cat will help keep them away from busy roads, but some indoor environments can become predictable and boring, leading to stress, inactivity and obesity.
It can be particularly hard for cats to cope with living indoors if they have lots of energy, love to explore and have previously been allowed time outdoors.
However for some cats, for example those with a disability or medical problem, living indoors could be a better option, and they may feel more comfortable.
Bear in mind that indoor cats require lots more of your time and effort to be happy and healthy.